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arXiv · 2409.12594

Probing exotic cross-shell interactions at N=28 with single-neutron transfer on 47K

C. J. Paxman·A. Matta·W. N. Catford·G. Lotay·M. Assié·E. Clément·A. Lemasson·D. Ramos·N. A. Orr·F. Galtarossa·V. Girard-Alcindor·J. Dudouet·N. L. Achouri·D. Ackermann·D. Barrientos·D. Beaumel·P. Bednarczyk·G. Benzoni·A. Bracco·L. Canete·B. Cederwall·M. Ciemala·P. Delahaye·D. T. Doherty·C. Domingo-Pardo·B. Fernández-Domínguez·D. Fernández·F. Flavigny·C. Fougères·G. de France·S. Franchoo·A. Gadea·J. Gibelin·V. González·A. Gottardo·N. Goyal·F. Hammache·L. J. Harkness-Brennan·D. S. Harrouz·B. Jacquot·D. S. Judson·A. Jungclaus·A. Kaşkaş·W. Korten·M. Labiche·L. Lalanne·C. Lenain·S. Leoni·J. Ljungvall·J. Lois-Fuentes·T. Lokotko·A. Lopez-Martens·A. Maj·F. M. Marqués·I. Martel·R. Menegazzo·D. Mengoni·B. Million·J. Nyberg·R. M. Pérez-Vidal·L. Plagnol·Zs. Podolyák·A. Pullia·B. Quintana·D. Regueira-Castro·P. Reiter·M. Rejmund·K. Rezynkina·E. Sanchis·M. Şenyiğit·N. de Séréville·M. Siciliano·D. Sohler·O. Stezowski·J. -C. Thomas·A. Utepov·J. J. Valiente-Dobón·D. Verney·M. Zielińska
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Abstract

We present the first measurement of the $^{47}$K($d,p\gamma$)$^{48}$K transfer reaction, performed in inverse kinematics using a reaccelerated beam of $^{47}$K. The level scheme of $^{48}$K has been greatly extended with nine new bound excited states identified and spectroscopic factors deduced. Detailed comparisons with SDPF-U and SDPF-MU shell-model calculations reveal a number of discrepancies with these results, and a preference for SDPF-MU is found. Intriguingly, an apparent systematic overestimation of spectroscopic factors and a poor reproduction of the energies for 1$^-$ states suggests that the mixing between the $\pi s^{\,\,\,1}_{1/2} d^{\,\,\,4}_{3/2}$ and $\pi s^{\,\,\,2}_{1/2} d^{\,\,\,3}_{3/2}$ proton configurations in $^{48}$K is not correctly described using current interactions, challenging our descriptions of light $N=28$ nuclei.

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C. J. Paxman, A. Matta, W. N. Catford, G. Lotay, M. Assié, E. Clément, A. Lemasson, D. Ramos, N. A. Orr, F. Galtarossa, V. Girard-Alcindor, J. Dudouet, N. L. Achouri, D. Ackermann, D. Barrientos, D. Beaumel, P. Bednarczyk, G. Benzoni, A. Bracco, L. Canete, B. Cederwall, M. Ciemala, P. Delahaye, D. T. Doherty, C. Domingo-Pardo, B. Fernández-Domínguez, D. Fernández, F. Flavigny, C. Fougères, G. de France, S. Franchoo, A. Gadea, J. Gibelin, V. González, A. Gottardo, N. Goyal, F. Hammache, L. J. Harkness-Brennan, D. S. Harrouz, B. Jacquot, D. S. Judson, A. Jungclaus, A. Kaşkaş, W. Korten, M. Labiche, L. Lalanne, C. Lenain, S. Leoni, J. Ljungvall, J. Lois-Fuentes, T. Lokotko, A. Lopez-Martens, A. Maj, F. M. Marqués, I. Martel, R. Menegazzo, D. Mengoni, B. Million, J. Nyberg, R. M. Pérez-Vidal, L. Plagnol, Zs. Podolyák, A. Pullia, B. Quintana, D. Regueira-Castro, P. Reiter, M. Rejmund, K. Rezynkina, E. Sanchis, M. Şenyiğit, N. de Séréville, M. Siciliano, D. Sohler, O. Stezowski, J. -C. Thomas, A. Utepov, J. J. Valiente-Dobón, D. Verney, M. Zielińska. 2024-09-19. Probing exotic cross-shell interactions at N=28 with single-neutron transfer on 47K. https://doi.org/10.1103/physrevlett.134.162504

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